“Did that really just happen?” —a behind the scenes look at IOI 2013
docs.google.com2 pointsby bvdbijl0 comments
Each submitted source program must be written in C, C++ or Pascal, it must be smaller than 100 KB, the evaluation server must be able to compile it in less than 10 seconds and at most 256 MB of memory. No other extensions different than the ones listed above will be run.
They put Python and Ruby on the machines so you can write a script to generate testcases, you can't submit programs written in those languages